We look at the division of 258318 by 15 
We want to figure out the number of times 258318 can be divided by 15.

Step 1:
If we divide 2 by 15, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 15

Let's proceed to step 2:
When dividing 25 by 15, we get 1 with a remainder of 10.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 15 from 25, we get 10.
Append the next digit (8) from the dividend to 10 and continue with: 108 / 15

Moving on to step 3:
108 divided by 15 is 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 17.0
Deduct 105 from 108 and we're left with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 15

On to step 4:
15 can be fit into 33 2 times, resulting in a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 172.0
Subtracting 30 from 33 leaves us with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 15

Step 5:
15 goes into 31 2 times with a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 1722.0
The remainder is 1 after subtracting 30 from 31.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 15

On to step 6:
15 can be fit into 18 1 times, resulting in a remainder of 3.
The next digit of our result is 1. 
Result so far: 17221.0
Deduct 15 from 18 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
If we divide 30 by 15, we get 2 and a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 17221.2
Subtract 30 from 30 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 17221.2
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 17221.2
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 17221.2 with a remainder of 0.0.